Huang Dawei, Pons Oriol, Albareda Albert
Department of Architectural Technology, Universitat Politècnica de Catalunya, Barcelona 08028, Spain.
Materials (Basel). 2020 May 9;13(9):2183. doi: 10.3390/ma13092183.
Sprayed mortar or shotcrete is a construction technology that could enhance existing masonry buildings' resilience by reinforcing low-safety load-bearing walls. Many factors affect the resistance of shotcrete-reinforced structures. One of the most important is the bond strength at the interface between the shotcrete and the reinforced wall. According to previous technical literature, bond strength usually has two evaluation criteria: shear and tensile strength. The experimental campaign described in this article focused on the bond strength between sprayed mortar and three masonry materials without the influence of normal force or constraint, as well as the roughness of these materials. The analysis of these tests focused on determining the relation between bond strength, roughness, and material strength. The analyses revealed that material strength has a more significant effect on bond strength than roughness, and bond strength is related to shrinkage of the materials. On the basis of previous theories, these researchers found that when there is no obvious influence due to normal force and constraint, the shear strength and tensile strength are different, and the shear strength is likely to be the cohesion force of the two materials. Finally, this article concludes with a novel logarithmic relationship between these strengths.
喷射砂浆或喷射混凝土是一种施工技术，可通过加固低安全承载墙来提高现有砖石建筑的抗震能力。许多因素会影响喷射混凝土加固结构的抗力。其中最重要的因素之一是喷射混凝土与被加固墙体之间界面的粘结强度。根据以往的技术文献，粘结强度通常有两个评估标准：抗剪强度和抗拉强度。本文所述的试验研究集中于无法向力或约束影响时喷射砂浆与三种砌体材料之间的粘结强度，以及这些材料的粗糙度。这些试验分析的重点是确定粘结强度、粗糙度和材料强度之间的关系。分析结果表明，材料强度对粘结强度的影响比粗糙度更为显著，且粘结强度与材料的收缩有关。基于以往的理论，这些研究人员发现，当无明显法向力和约束影响时，抗剪强度和抗拉强度不同，抗剪强度可能是两种材料的内聚力。最后，本文得出了这些强度之间一种新的对数关系。
